• Apply to 50 size helicopters, according to the strength character of 50 engine to design, features the highest air exhaust volume on the market.• Great design and test to three spaces: expansion ... [more]

ullet Apply to 90 size helicopters, according to the strength character of 90 engine to design, features much increase the horsepower, fuel-saving, low noise, and the highest air exhaust volume on the ... [more]